The BESIII Experiment at the Beijing Electron Positron Collider (BEPC2) has accumulated the world's largest samples of e+e- collisions in the tau-charm region. Cross sections of e+e- --> pi+pi- psi(2S) above 4.0 GeV, and a charged structure has been observed in the pi psi(2S) mass spectrum. Cross sections of e+e- --> KKbar J/psi between 4189 and 4600 MeV. Compared with pi+ pi- J/psi, more complex structure in the line shape is observed. Quantum number J^P of Zc(3900) is determined to be 1^+ by partial wave analysis of e^+ e^- -> pi^+ pi^- J/psi at 4.23 and 4.26 GeV. Observation of e+e- -> eta' Jpsi at center-of-mass energies between 4.190 and 4.600 GeV.